Reinforcement for concrete structures



A. c. maes.

REINFORCENIENTFR CONCRETE STRUCTURES. APPLICATION FILED 11u15, 191s;

1,367,294. Peeented Feb. 1,1921.

iwallu veutoz UNITED STATES ABEL C. BRIGGS, OF WILMNGTON, OHIO.

nnrNFoncnMnNT Fon ooNcenTn STRUCTURES,

Specification of Letters Patent.

I atented Feb. 1 1921.

Application filled May 15, 1918. Serial N0. 234,658.

To alt Aw hom it may concem Be it known that I, ABEL C. Barcos, a citizen of the United States, residing at Wilmington, in the county of Clinton and State of Ohio, have invented certain new and useful Improvements in Reinforcments for Concrete Structures, of which the following is a specification. l

This invention relates to metallic reinforo ing means for use in strengthening and bracing concrete and similar monolithic structures, and one of the principal objects of the invention is to produce a reinforcement of simple and eiiicient construction so formed as to be capable of developing maximum load receiving properties in proportion to the amount of material used, this advantage being effected through a novel manner of placing, combining and distributing the cooperative members of the reinforcement Forming the subject matter of this inivention.`

Another object of the invention resides in a metallic reinforcement of the above character wherein is embodied a load receiving girder or beam which, in use, is adapted to be embedded in concrete and to have mounted thereon a plurality of reinforcing rods of peculiar construction and operation, said rodsV being so formed and placed that when embedded in concrete and associated with said beam they will serve to enhance the strength of the latter and increase its value as a girder.

A further object of the invention resides in the novel form of metallic reinforcement particularly designed for use in connection with concrete bridges and similar structures, in order that the latter Will be fully capable of withstanding the usual external stresses and loads to which they are subjected and, also with an equal degree of facility the complex internal stresses.`

Still, a further object is to provide a reinforcement of the type stated wherein the members comprising the same are so correlated that the same may be easily and rapidly assembled on the ground where the structure is being erected and prior to the process of embedding the same in concrete.

iVith these and other objects in view, as will appear as the description proceeds, the invention accordingly consists in the novel features of construction, combination of elements and arrangement of parts hereinafter fully described and having' the scope thereof indicated by the appended claim.

In the drawing', wherein has been shown one of the preferred embodiments of the invention, i

Figure l is a fragmentary side elevation of a concreto bridge and illustrating the reinforcing mechanism com )rising the present invention applied therein; parts of the bridge structure being broken away to disclose the underlying reinforcing structure,

lfig. 2 is an end elevation of the parts shown in Fig. l,

Fig. 3 a fragmentaryV side elevation of the reinforcing structure, andA Fig. fl is a transverse sectional View., disclosing more particularly the manner of positioning and connecting the rod members with the beam construction.

Similar characters of` reference denote corresponding parts throughout the several views of the drawing.

T Referring more particularly to the details of the invention, the reinforcement A is preferably used in connection with a concrete bridge structure B and, while the features of the invention are admirably dis'- closed by illustrating the same in connection with the structure B, itwill be appreciated that the reinforcement is not limited solely to this particular use, as the same may be applicable with a similar degree of elliciency in reinforcing many other types of concrete or monolithic structures. In the present instance, the reinforcement A consists of a plurality of I beams or girders 2 which are positioned to extend longitudinally of the structure B, these beams being designed to carry a load or to act as a girder.

ln order to permit smaller style beams to be employed in concrete bearings than have been formerly employed, and to coma bine the saine with concrete in such manner as to increase their strength and to add to their value as girders,` there is provided a plurality of reinforcing rods l, lwhich are formed from twisted or deformed material, and are preferably bent upon themselves to provide central, girder embracing yoke shaped portions 5. The portions 5 end in 'obliquely and upwardly extending parallel arms t3, which are formed to terminate in forwardly horizontally extending parallel terminals 7, the ends of the terminals, as shown, being extended to overlap and en gage the next contiguous set of terminals formed upon adjacent rod members, this lat- .feature being effected by placing the tional area.

Y tothe filling in of concrete.

rods at spaced intervals along the length of the beam 2. The rods are held in place by wiring the same to the beam or preferably through the agency of hook bolts 8 which pass through the web of the beam and are drawn into rigid or holding engagement with the rods by the use of threaded nuts 9.

In operation, the steel beam 2 being designed to carry a load, is self supporting and hence may be placed into position first. The rods 4 are then secured in their proper operative positions upon the beam and prior After the reinforcing structure has been properly assembled, the forms (not shown) are placed and the concrete poured, which permits the reinforcing 'structure to be incased in the manner clearly shown in Fig. 1. By the peculiar arrangement of the rods et, the relativelysmall beam or girder 2 is capable of withstanding the stresses and loads with the same'degree of facility and strength as a beam substantially three times its cross sec- For example, a 3 inch steel beam, 5.5 lbs. can be made to develop the strength of a 9 inch steel beam, 2l lbs. or a 4 inch beam, 7.5 lbs. may similarly develop the sustaining properties of a 12 inch steel beam, 31.5 lbs., if the larger beams were employed in the capacity stated. These changes being attained without a corresponding increase in the cost of production.

This system of reinforcing is capable of being easily and rapidly assembled on the ground of operation, and the material employed therein does not have to be treated or otherwise altered during the assembling operation.

From the foregoing description, taken in connection with the accompanying drawing, it will be seen that there is provided a reinforcement of a singularly substantial, eilicient and economical nature, and one which will be fully capable 0f prolonged and ellicient service. Through the placing and distributing the rods LLL, the girder or beam 2 may be relatively small in proportion to the load placed thereon by the structure B, thus producing economy with regard to the amount of material employed. f

The rods are so constructed as to be capable of being quickly and conveniently applied in connection with the beam 2 without in any Way altering their general formation or construction, and may be securely held in place by virtue of the hook bolts or their equivalents 8.

I claim:

A reinforcement for concrete structures, comprising a longitudinally extendinggirder having upper and lower flanges of equal Width and an intervening and connecting web portion, shear members carried by .said girder and located in longitudinally spared positions thereon, each of said shear members consisting 0f a metallic rod bent upon itself to provide a centrally situated yoke shaped portion, between the arms of which said girder extends, and said armsl above said girder being bent at an angie to said yoke shaped portion so as to extend obliquely upward, a bolt for each of said shear incinbers arranged to passthrough an opening formed in the web portion of said girder. said bolt having a hook shaped portion at one end arranged to engage one of the arms` of the shear member with which it is associated, and a nut threaded upon the opposite end of said bolt and serving to securely clamp the shear member to said girder.

In testimony whereof I ailix my signature.

ABEL C, BRIGGS.

manner of 

